Search found 1783 matches

by kalvado
Fri May 31, 2019 4:44 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Without doubt, this is one of the major crisis in civil aircraft industry that raise very important and disturbing questions about safety on all levels. The whole picture look incoherent and maybe nobody is actually certain that the picture is yet complete. This industry need to recover a coherent ...

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by kalvado
Fri May 31, 2019 4:02 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

unlike humans being sent to jail, airplane grounding is not a punitive action - the main goal of grounding is to prevent accidents from a known cause which may occur before the fix is done. If probability exceeds certain threshold, then grounding is warranted. There is no indication that whatever s...

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by kalvado
Fri May 31, 2019 2:18 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Just using this section of your post, why are we still talking about MAX grounding, all Boeing a/c should be grounded, what other safety features in other a/c now flying have they hidden from the FAA and the clients? If they are this bad on the MAX we think they are perfect on other a/c? If we beli...

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by kalvado
Fri May 31, 2019 2:10 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Please read Page 32-33 of the preliminary crash report - how does that not make the condition clear and show a way to deal with it. This is a different procedure than runaway trim. We have no evidence they did not carry out the Page 32-33 procedure. Au contraire. They did use the cut-off switches. ...

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by kalvado
Fri May 31, 2019 12:22 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

In grandfatheringspeak, it is a light :) (if pre-NG aircraft had that functionality it could only be a light, right?) Thank you xmp. A symbol illuminates / icon is displayed / lights up. Why didn't Boeing disclose the inoperative icon display if known since 2017? We don't know why - but we do know ...

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by kalvado
Fri May 31, 2019 3:11 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

What in the world does EA 401 have to do with these two accidents? It was gear light there. EA 401 was an example of humans being so fixated on one thing that they fail to address the other issues at hand. And, to repeat for the tenth time, there is NO “roller coaster” maneuver. The pilot merely re...

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by kalvado
Thu May 30, 2019 4:03 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

One can envision a few possible failures creating artificial stop. Pure speculation below: - at high force point, backup nut separated from the mount and prevented main nut going up the jackscrew acting as a lock nut. - At high force, one of the nuts damaged jackscrew preventing other nut moving ov...

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by kalvado
Thu May 30, 2019 3:10 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I know you have a suspician that the electric trim was unable to continue trimming nose up because it stopped at 2.3 units each time. Without knowing exactly what the forces involved were and the power of the motor, we can't (as people on a.net) possibly determine if there was a mechanical limit in...

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by kalvado
Wed May 29, 2019 9:46 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I couldnt edit my post anymore, but let's assume my assumption of 4 vane failures was wrong and instead there were 8 vane failures. The failure rate for pilots halves to 25%. But 8 vane failures means mean time to failure for the vane is also halved to 125k hours, and the failure rate for pilots ne...

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by kalvado
Wed May 29, 2019 4:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

SELMER40 wrote:
http://flightaware.com/live/flight/BOE393
What kind of flying has Boeing 393 been doing/is doing now?

There is also BOE320 also heading to SKF, a USAF field. Some demos/tests over there maybe?

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by kalvado
Tue May 28, 2019 4:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I am surprised that the regulations don't require that the elevator be capable of counteracting full nose up and full nose down trim. Not so much for the (previously very rare) runaway stabilizer but in case the jackscrew is jammed at one extreme. I wouldn't be surprised if there are more aircraft ...

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by kalvado
Mon May 27, 2019 3:04 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Why while increasing back pressure, did they not continue trimming? The switches worked. I think they weren’t trimming as every manually switch moved the stab. It lifted off with about 5 units up but never got back to anything 5 units. Take off trim is approximately V2. Gf Jammed jackscrew never ha...

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by kalvado
Mon May 27, 2019 1:37 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

At 05:40:12, approximately three seconds after AND stabilizer motion ends, electric trim (from pilot activated switches on the yoke) in the Aircraft nose up (ANU) direction is recorded on the DFDR and the stabilizer moved in the ANU direction to 2.4 units. The Aircraft pitch attitude remained about...

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by kalvado
Sun May 26, 2019 12:24 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

But then what Pilot standard are you certifying too? I've asked that many times and the one's on here who keep saying it has nothing to do with the pilots - please answer this question. What type of fault/parts failure should Pilot's be expected to handle as part of their type rating? That is part ...

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by kalvado
Sat May 25, 2019 5:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

My oh my, all of this discussion by the FAA and others regarding the returned to service projected date for the MAX (which BTW seems to change every time the acting FAA Administrator makes a statement in the media) and yet there is no formal projected date for when the Final Accident Reports (FAR) ...

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by kalvado
Sat May 25, 2019 10:36 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

So the certification of the hand trim wheel is in question? Which I assume was not self certified by Boeing but by the FAA on the 727 or 707, and in what year? Was a pretty obvious outcome once blowback became a concern. Probably was ok on smaller planes with roller coaster procedure in the manual....

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by kalvado
Sat May 25, 2019 10:03 am
Forum: Civil Aviation
Topic: Financial effect of the 737MAX grounding
Replies: 61
Views: 6645

Re: Financial effect of the 737MAX grounding

Boeing can still build the NG, it is still certified and good to go! Not for long, it seems: https://www.wsj.com/articles/maxs-return-to-flight-delayed-by-faas-reevaluation-of-safety-procedures-for-older-737-models-11558728091 The Classic-NG-MAX saga sure is coming back to bite Boeing in the tail c...

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by kalvado
Fri May 24, 2019 4:18 pm
Forum: Civil Aviation
Topic: Financial effect of the 737MAX grounding
Replies: 61
Views: 6645

Re: Financial effect of the 737MAX grounding

Cash flow might be tight. 60 aircraft a month at 50M is 3B per month missing cash flow, not that it won't come back when they do get delivered. That's another 100M to 200M in finance costs to replace that cash flow. 1B to the crash victims, 1B to the airlines, 1B for new software, training and fina...

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by kalvado
Fri May 24, 2019 3:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

A company needs to decide at the highest level - ISO 9001-type certification, or get a fix out "tomorrow" by letting Coding King work it overnight without supervision! Or testing! Or review, verification, and updating the entire documentation suite! Sounds like MCAS V1 to me There was a m...

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by kalvado
Fri May 24, 2019 3:40 pm
Forum: Civil Aviation
Topic: Financial effect of the 737MAX grounding
Replies: 61
Views: 6645

Re: Financial effect of the 737MAX grounding

Correct me if I'm wrong but out of five passenger aircraft models the Boeing currently produces: - One is grounded under a huge scandal and is investigated for cutting the safety corners - One is suspected to be produced under subpar production standards in a place that was chosen only for its lack...

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by kalvado
Fri May 24, 2019 12:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I really don't understand why there are people that seem to get excited for any potential bad news for Boeing. If, God forbid, there is another MAX incident after it returns to service there are several posters on here that seem like they'd almost be happy (even if the incident has nothing to do wi...

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by kalvado
Thu May 23, 2019 8:24 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Setting up a gym for pilots in every terminal should work... All you need is a Control Column and a thrust lever... Are you a pilot? - if so I pray I am never on one of your flights. Why, we're taking about good training opportunity. It should prepare pilots to handle extreme events. Just put appro...

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by kalvado
Thu May 23, 2019 7:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Yes I'm sure Boeing designed a plane on purpose to crash as that does such good things for it's bottom line. All designs are a compromise between safety, efficiency and cost and sometimes engineers make mistakes based on bad assumptions that pilots are able to handle the situations they supposedly ...

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by kalvado
Thu May 23, 2019 4:32 pm
Forum: Civil Aviation
Topic: FAA Inspectors Accusing Agency of Negligence
Replies: 37
Views: 3685

Re: FAA Inspectors Accusing Agency of Negligence

My impression is that overly strict safety requirements are another layer of redundancy: if there are some violations, they would probably still be contained. Just don't push those limits too hard. The multiple billion dollar question is for you to define is what is "too hard". To the NTS...

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by kalvado
Thu May 23, 2019 3:50 pm
Forum: Civil Aviation
Topic: FAA Inspectors Accusing Agency of Negligence
Replies: 37
Views: 3685

Re: FAA Inspectors Accusing Agency of Negligence

My impression is that overly strict safety requirements are another layer of redundancy: if there are some violations, they would probably still be contained. Just don't push those limits too hard.

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by kalvado
Thu May 23, 2019 3:06 pm
Forum: Civil Aviation
Topic: UA's Munoz: Will be on first 737 MAX flight, willing to change flights for customers
Replies: 116
Views: 16295

Re: UA's Munoz: Will be on first 737 MAX flight, willing to change flights for customers

Well you know its just a matter of time before another MAX has an incident/accident of some sort, but totally unrelated to MCAS. The real test is to see how the traveling public reacts to that as the media will be all over it with their typical misinformation and bombastic headlines. Real test is w...

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by kalvado
Thu May 23, 2019 2:35 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I don't believe that anybody is happy about any aspect of the MAX grounding. It is clear, that on-topic posts in this thread predominantly won't paint a nice picture of Boeing. That is inevitable. Similar like the A380 production stop thread about Airbus. This thread here by nature is a hard topic ...

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by kalvado
Thu May 23, 2019 2:33 pm
Forum: Civil Aviation
Topic: UA's Munoz: Will be on first 737 MAX flight, willing to change flights for customers
Replies: 116
Views: 16295

Re: UA's Munoz: Will be on first 737 MAX flight, willing to change flights for customers

The 737 - in all its forms - has proven to be around for many, many, many, many years (including those with rudder issues). And as far as sales goes...thousands to come. Not arguing that it's not proven (although the MAX isn't - yet), but it's not the safest plane in the sky. That honour goes to th...

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by kalvado
Wed May 22, 2019 9:00 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Because none of the simulations I've seen posted have attempted to simulate recovery starting from the beginning of the MCAS runaway. If you know of one, then I'd like you to point me to it since you are using them as part of your argument that they "just managed to avoid crash." That is ...

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by kalvado
Wed May 22, 2019 8:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I agree with your thought process. However, there would be a disconnect between it being an acceptable risk on the NG and the NNC being a memory item. If the failure rate is on the order of a wing falling off, why make it a memory item? Just a guess: 737 history. At some point in the past the runaw...

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by kalvado
Wed May 22, 2019 3:54 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Sine we now know that the Simulator significantly under performs in terms of the forces on the trim wheel, I think all bets are off regarding the accuracy of any of the simulations and their results either way. They will need to be run again with the new setup before any realism can be ascribed. Wo...

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by kalvado
Wed May 22, 2019 3:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

On the training front, you are missing the big picture. In my opinion, the training issues that exist are not specific to the 737MAX. We can't know for sure until the final reports on both crashes, but I do not believe, based on available evidence, that either crew would have recovered from a runaw...

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by kalvado
Wed May 22, 2019 1:56 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

You are thinking of the AD and not what was actually in the FCOM that the pilots rely on which has return the trim to neutral in the first paragraph - not much ambiguity in that. Thanks for proving my point. There shouldn't be twenty different versions describing same procedure. Hire qualified docu...

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by kalvado
Wed May 22, 2019 1:50 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Umm - they published procedures that if they had been followed we would not be having this discussion. Too bad Boeing technical writers couldn't put together an unambiguous text without internal contradictions. Definitely a training issue, as with most Boeing workforce. And too bad distinction betw...

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by kalvado
Wed May 22, 2019 12:58 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

OK then, I'll take it at face value that your newly voiced sympathy for accident victims is more genuine than your emnity for so many things you've repeated so many times on this forum. Yes victims first of Boeing's negligent design and than the callous disregard in taking no action after the Lion ...

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by kalvado
Tue May 21, 2019 9:22 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

On a different tack, without discussing the minutiae of MCAS design and implementation - or any other particular system, will the scrutiny of the processes involved in MAX certification result in further elements of the 737 MAX being subject to investigation? The logic would be that if MCAS was dee...

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by kalvado
Tue May 21, 2019 8:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

But what we see on the other hand is a large majority of posts by Boeing apologists who try to distribute blame away from Boeing. Well, that's a mighty uncharitable characterization, one that in my mind nullifies the rest of your post. For the record, I do not "try to distribute blame away fro...

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by kalvado
Tue May 21, 2019 7:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

This can be the thread where you Boeing bash all day long and we will make another one about training? Would that make you happy? I don't believe that anybody is happy about any aspect of the MAX grounding. It is clear, that on-topic posts in this thread predominantly won't paint a nice picture of ...

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by kalvado
Tue May 21, 2019 6:58 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

My apologies if this has already been posted, but there is now speculation that bird strikes to the MCAS sensor might have caused the crash: https://www.theguardian.com/business/2019/may/21/boeing-737-max-crash-bird-collision-ethiopian-airlines ccording to the Wall Street Journal, US aviation autho...

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by kalvado
Tue May 21, 2019 6:05 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

My apologies if this has already been posted, but there is now speculation that bird strikes to the MCAS sensor might have caused the crash: https://www.theguardian.com/business/2019/may/21/boeing-737-max-crash-bird-collision-ethiopian-airlines ccording to the Wall Street Journal, US aviation autho...

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by kalvado
Tue May 21, 2019 6:02 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Well then you better condemn the A320 as well. It's fallback system is a Manual trim wheel as well. If needed in an Emergency in an out of trim condition at Vmo or over I would have to guess that it would be pretty hard to turn and the Elevators would suffer from blowback as well. It's amazing that...

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by kalvado
Tue May 21, 2019 5:33 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

On a different tack, without discussing the minutiae of MCAS design and implementation - or any other particular system, will the scrutiny of the processes involved in MAX certification result in further elements of the 737 MAX being subject to investigation? The logic would be that if MCAS was dee...

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by kalvado
Tue May 21, 2019 5:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Runaway Stabilizer and blowback effect apply to all commerical jets - they are not 737 Unique and would be covered by basic training. I think someone showed an excerpt from an actual 737 training manual or document a week or two ago and Boeing does mention that you may have to relieve pressure on t...

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by kalvado
Tue May 21, 2019 4:56 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

After the EAD, the world knew about MCAS and Boeing did not prevent any airline operating the MAX from training for a Stabilizer Runaway. Yet ET 302 still crashed. As details of runaway stabilizer - blowback effect, roller coaster trim procedure - were not communicated to airlines (probably because...

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by kalvado
Tue May 21, 2019 3:10 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

So you want really insist on Boeing telling everybody about MCAS and allowing training for that new dangerous situation, would not have prevented the crashes? Really? After the EAD, the world knew about MCAS and Boeing did not prevent any airline operating the MAX from training for a Stabilizer Run...

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by kalvado
Mon May 20, 2019 8:27 pm
Forum: Civil Aviation
Topic: B 797 - One pilot cockpit?
Replies: 177
Views: 17903

Re: B 797 - One pilot cockpit?

Can be something designed with 2 pilot seats and provisions for eventual downgrade for 1, e.g. remote control built in but not activated until approved. Zero-pilot flight may have reduced functionality, e.g. divert to nearest airport only, with ATC giving priority pass to a troubled aircraft. Pilot ...

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by kalvado
Mon May 20, 2019 6:17 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Avoiding a stall in banking turn, in turbulence, close to MTOW, with aft CoG, in a high work load environment, may be a bit more complicated. Add to that picture a lack of (natural) pitch stability margin (like the MAX), things might get out of your hands pretty quickly. I tend to believe that he F...

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by kalvado
Mon May 20, 2019 2:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Simulations have shown the ET coud not have recovered, so to say they should have been able to recover is based largely just on wishful thinking. Especially given the pilots were just following B procedures. Training can/should be improved, but the most important steps to achieve this is B has to p...

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by kalvado
Mon May 20, 2019 1:36 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

You could also evolve your mindset. I do not think it is unreasonable to expect that pilots can perform a NNC, especially one that is a memory item. It shouldn't matter that there are other alerts and confusion. They should be trained to handle non-normal situations (hence the name of the checklist...

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by kalvado
Mon May 20, 2019 2:43 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 383028

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Ah yes when a plane is trying to pitch itself into the ground and kill you the first thing you will think about is running the airspeed unreliable checklist. On another note, wasn't there a discussion about the 737 MAXs trim wheel being more difficult to use than the NG, and that's why they kept el...

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